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Motion







9. Uniform circular motion

  • When an object moves in a circular path at a constant speed then motion of the object is called uniform circular motion.
  • In our everyday life ,we came across many examples of circular motion for example cars going round the circular track and many more .Also earth and other planets revolve around the sun in a roughly circular orbits
  • If the speed of motion is constant for a particle moving in a circular motion still the particles accelerates because of constantly changing direction of the velocity.
  • If an object moves in a circular path with uniform speed, its motion is called uniform circular motion
  • Here in circular motion, we use angular velocity in place of velocity we used while studying linear motion.
  • Force which is needed to make body travel in a circular path is called centripetal force.
  • We know that the circumference of a circle of radius \(r\) is given by \(2\pi r\). If the body takes \(t\) seconds to go once around the circular path of radius \(r\), the velocity \(v\) is given by
    \(v = \frac{{2\pi r}}{t}\)
  • One thing we must keep in mind is that uniform linear motion is not accelerated but uniform circular motion is accelerated motion.


  • Examples of uniform circular motion are
    (a) Motion of artificial satellites around the earth
    (b) Moon, the natural satellite of earth, moves in uniform circular motion round the earth.
    (c) Cyclist moving on a circular track with a constant speed exhibits uniform circular motion.


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Class 9 Maths Class 9 Science
Reference Books for class 9 science

Given below are the links of some of the reference books for class 9 science.

These books by S.Chand Publications are detailed in their content and are must have books for class 9 students.
  1. Science for Ninth Class Part1 Physics
  2. Science for Ninth Class Part2 Chemistry
  3. Science for Ninth Class Part3 Biology
Some other books that might be worth considering are
  1. Oswaal CBSE Question Bank Class 9 Science Chapterwise & Topicwise We all know importance of practicing what we have studied. This book is perfect for practicing what you have learned and studied in the subject.
  2. Pearson Foundation Series (IIT-JEE/NEET) Physics, Chemistry, Maths & Biology for Class 9 (Main Books) | PCMB Combo These Foundation books would be helpful for students who want to prepare for JEE/NEET exams. Only buy them if you are up for some challenge and have time to study extra topics. These might be tough for you and you might need extra help in studying these books.
  3. Foundation Science Physics for Class - 9 by H.C. Verma This is one of my favorite Physics book for class 9. Most of the book is within the limits of CBSE syllabus. It might overwhelm you with its language but I feel if you can understand the content is authentic with plenty of problems to solve.

You can use above books for extra knowledge and practicing different questions.







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